Unable to open downloaded setup file

I've downloaded avgas-setup-7.5.0.50.exe several times and I'm having difficulty opening it.

I've downloaded it with ie7, firefox and wget. I've downloaded it to 2 different computers and to a network drive. After each download, when I try to launch it, I get some variation of an "access denied" message. Often I get "Windows cannot access the specified device, path of file. You may not have the appropriate permissions to access the item".

The permissions on the file seem fine. The size of the file is 6,469,352 bytes. I can't compute and md5 checksum because the md5 utility can't open it.

For all three extensions, I get the same message when I try to launch the program: "Windows cannot access the specified device, path of file. You may not have the appropriate permissions to access the item".

Thanks for the help, everyone. I finally got it working with yet another download to another computer using Firefox. I'm not entirely sure what I did differently. I think the problem was probably ie7 related; possibly it was a combination of the things mentioned in this thread , though none of the fixes there actually fixed my problem.